Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-09-11
1993-02-23
Young, Wayne R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 54, 369110, 369112, 369116, 369120, G11B 7095
Patent
active
051896559
ABSTRACT:
An optical head, for an optical disk recording/reproducing apparatus, for irradiating a recording medium by a light beam emitted from a light source and introducing an information light formed by a light beam reflected from the recording medium to a photo detector, a shift of an optical axis of the information light being minimized. The optical head includes a unit for receiving the information light which is reflected from the recording medium, a first reflecting unit for reflecting such information light, a second reflecting unit for reflecting the information light reflected by the first reflecting unit and for directing the reflected information light toward the photo detecting system, and a unit for emerging the information light reflected by the second reflecting unit to the photo detecting system. The first reflecting unit has a surface for reflecting the information light thereby, and the second reflecting unit also has a surface for reflecting the reflected information light from the surface of the first reflecting unit. The surface of the first reflecting unit is substantially parallel to the surface of the second reflecting unit. The emerging surface has a surface from which the information light reflected by the surface of the second reflecting unit emerges. An angle between the surface of the receiving unit and the surface of the first reflecting unit is substantially equal to an angle between the surface of the second reflecting unit and the surface of the emerging unit.
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Ogata Nobuo
Sato Hideaki
Sekimoto Yoshihiro
Tanaka Toshiyuki
Ueyama Tetsuo
Conlin David G.
O'Connell Robert F.
Sharp Kabushiki Kaisha
Young Wayne R.
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